1 /*- 2 * Copyright (C) 1996 3 * David L. Nugent. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #ifndef lint 28 static const char rcsid[] = 29 "$FreeBSD$"; 30 #endif /* not lint */ 31 32 #include <ctype.h> 33 #include <err.h> 34 #include <termios.h> 35 #include <stdbool.h> 36 #include <unistd.h> 37 #include <grp.h> 38 #include <libutil.h> 39 40 #include "pw.h" 41 #include "bitmap.h" 42 43 44 static struct passwd *lookup_pwent(const char *user); 45 static void delete_members(char ***members, int *grmembers, int *i, 46 struct carg *arg, struct group *grp); 47 static int print_group(struct group * grp); 48 static gid_t gr_gidpolicy(struct userconf * cnf, long id); 49 50 int 51 pw_group(int mode, char *name, long id, struct cargs * args) 52 { 53 int rc; 54 struct carg *arg; 55 struct group *grp = NULL; 56 int grmembers = 0; 57 char **members = NULL; 58 struct userconf *cnf = conf.userconf; 59 60 static struct group fakegroup = 61 { 62 "nogroup", 63 "*", 64 -1, 65 NULL 66 }; 67 68 if (mode == M_LOCK || mode == M_UNLOCK) 69 errx(EX_USAGE, "'lock' command is not available for groups"); 70 71 /* 72 * With M_NEXT, we only need to return the 73 * next gid to stdout 74 */ 75 if (mode == M_NEXT) { 76 gid_t next = gr_gidpolicy(cnf, id); 77 if (getarg(args, 'q')) 78 return next; 79 printf("%u\n", next); 80 return EXIT_SUCCESS; 81 } 82 83 if (mode == M_PRINT && getarg(args, 'a')) { 84 SETGRENT(); 85 while ((grp = GETGRENT()) != NULL) 86 print_group(grp); 87 ENDGRENT(); 88 return EXIT_SUCCESS; 89 } 90 if (id < 0 && name == NULL) 91 errx(EX_DATAERR, "group name or id required"); 92 93 grp = (name != NULL) ? GETGRNAM(name) : GETGRGID(id); 94 95 if (mode == M_UPDATE || mode == M_DELETE || mode == M_PRINT) { 96 if (name == NULL && grp == NULL) /* Try harder */ 97 grp = GETGRGID(id); 98 99 if (grp == NULL) { 100 if (mode == M_PRINT && getarg(args, 'F')) { 101 char *fmems[1]; 102 fmems[0] = NULL; 103 fakegroup.gr_name = name ? name : "nogroup"; 104 fakegroup.gr_gid = (gid_t) id; 105 fakegroup.gr_mem = fmems; 106 return print_group(&fakegroup); 107 } 108 if (name == NULL) 109 errx(EX_DATAERR, "unknown group `%s'", name); 110 else 111 errx(EX_DATAERR, "unknown group `%ld'", id); 112 } 113 if (name == NULL) /* Needed later */ 114 name = grp->gr_name; 115 116 /* 117 * Handle deletions now 118 */ 119 if (mode == M_DELETE) { 120 rc = delgrent(grp); 121 if (rc == -1) 122 err(EX_IOERR, "group '%s' not available (NIS?)", 123 name); 124 else if (rc != 0) { 125 err(EX_IOERR, "group update"); 126 } 127 pw_log(cnf, mode, W_GROUP, "%s(%ld) removed", name, id); 128 return EXIT_SUCCESS; 129 } else if (mode == M_PRINT) 130 return print_group(grp); 131 132 if (id > 0) 133 grp->gr_gid = (gid_t) id; 134 135 if (conf.newname != NULL) 136 grp->gr_name = pw_checkname(conf.newname, 0); 137 } else { 138 if (name == NULL) /* Required */ 139 errx(EX_DATAERR, "group name required"); 140 else if (grp != NULL) /* Exists */ 141 errx(EX_DATAERR, "group name `%s' already exists", name); 142 143 extendarray(&members, &grmembers, 200); 144 members[0] = NULL; 145 grp = &fakegroup; 146 grp->gr_name = pw_checkname(name, 0); 147 grp->gr_passwd = "*"; 148 grp->gr_gid = gr_gidpolicy(cnf, id); 149 grp->gr_mem = members; 150 } 151 152 /* 153 * This allows us to set a group password Group passwords is an 154 * antique idea, rarely used and insecure (no secure database) Should 155 * be discouraged, but it is apparently still supported by some 156 * software. 157 */ 158 159 if ((arg = getarg(args, 'h')) != NULL || 160 (arg = getarg(args, 'H')) != NULL) { 161 if (strcmp(arg->val, "-") == 0) 162 grp->gr_passwd = "*"; /* No access */ 163 else { 164 int fd = atoi(arg->val); 165 int precrypt = (arg->ch == 'H'); 166 int b; 167 int istty = isatty(fd); 168 struct termios t; 169 char *p, line[256]; 170 171 if (istty) { 172 if (tcgetattr(fd, &t) == -1) 173 istty = 0; 174 else { 175 struct termios n = t; 176 177 /* Disable echo */ 178 n.c_lflag &= ~(ECHO); 179 tcsetattr(fd, TCSANOW, &n); 180 printf("%sassword for group %s:", (mode == M_UPDATE) ? "New p" : "P", grp->gr_name); 181 fflush(stdout); 182 } 183 } 184 b = read(fd, line, sizeof(line) - 1); 185 if (istty) { /* Restore state */ 186 tcsetattr(fd, TCSANOW, &t); 187 fputc('\n', stdout); 188 fflush(stdout); 189 } 190 if (b < 0) 191 err(EX_OSERR, "-h file descriptor"); 192 line[b] = '\0'; 193 if ((p = strpbrk(line, " \t\r\n")) != NULL) 194 *p = '\0'; 195 if (!*line) 196 errx(EX_DATAERR, "empty password read on file descriptor %d", fd); 197 if (precrypt) { 198 if (strchr(line, ':') != NULL) 199 return EX_DATAERR; 200 grp->gr_passwd = line; 201 } else 202 grp->gr_passwd = pw_pwcrypt(line); 203 } 204 } 205 206 if (((arg = getarg(args, 'M')) != NULL || 207 (arg = getarg(args, 'd')) != NULL || 208 (arg = getarg(args, 'm')) != NULL) && arg->val) { 209 int i = 0; 210 char *p; 211 struct passwd *pwd; 212 213 /* Make sure this is not stay NULL with -M "" */ 214 extendarray(&members, &grmembers, 200); 215 if (arg->ch == 'd') 216 delete_members(&members, &grmembers, &i, arg, grp); 217 else if (arg->ch == 'm') { 218 int k = 0; 219 220 if (grp->gr_mem != NULL) { 221 while (grp->gr_mem[k] != NULL) { 222 if (extendarray(&members, &grmembers, i + 2) != -1) 223 members[i++] = grp->gr_mem[k]; 224 k++; 225 } 226 } 227 } 228 229 if (arg->ch != 'd') 230 for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) { 231 int j; 232 233 /* 234 * Check for duplicates 235 */ 236 pwd = lookup_pwent(p); 237 for (j = 0; j < i && strcmp(members[j], pwd->pw_name) != 0; j++) 238 ; 239 if (j == i && extendarray(&members, &grmembers, i + 2) != -1) 240 members[i++] = newstr(pwd->pw_name); 241 } 242 while (i < grmembers) 243 members[i++] = NULL; 244 grp->gr_mem = members; 245 } 246 247 if (conf.dryrun) 248 return print_group(grp); 249 250 if (mode == M_ADD && (rc = addgrent(grp)) != 0) { 251 if (rc == -1) 252 errx(EX_IOERR, "group '%s' already exists", 253 grp->gr_name); 254 else 255 err(EX_IOERR, "group update"); 256 } else if (mode == M_UPDATE && (rc = chggrent(name, grp)) != 0) { 257 if (rc == -1) 258 errx(EX_IOERR, "group '%s' not available (NIS?)", 259 grp->gr_name); 260 else 261 err(EX_IOERR, "group update"); 262 } 263 264 if (conf.newname != NULL) 265 name = conf.newname; 266 /* grp may have been invalidated */ 267 if ((grp = GETGRNAM(name)) == NULL) 268 errx(EX_SOFTWARE, "group disappeared during update"); 269 270 pw_log(cnf, mode, W_GROUP, "%s(%u)", grp->gr_name, grp->gr_gid); 271 272 free(members); 273 274 return EXIT_SUCCESS; 275 } 276 277 278 /* 279 * Lookup a passwd entry using a name or UID. 280 */ 281 static struct passwd * 282 lookup_pwent(const char *user) 283 { 284 struct passwd *pwd; 285 286 if ((pwd = GETPWNAM(user)) == NULL && 287 (!isdigit((unsigned char)*user) || 288 (pwd = getpwuid((uid_t) atoi(user))) == NULL)) 289 errx(EX_NOUSER, "user `%s' does not exist", user); 290 291 return (pwd); 292 } 293 294 295 /* 296 * Delete requested members from a group. 297 */ 298 static void 299 delete_members(char ***members, int *grmembers, int *i, struct carg *arg, 300 struct group *grp) 301 { 302 bool matchFound; 303 char *user; 304 char *valueCopy; 305 char *valuePtr; 306 int k; 307 struct passwd *pwd; 308 309 if (grp->gr_mem == NULL) 310 return; 311 312 k = 0; 313 while (grp->gr_mem[k] != NULL) { 314 matchFound = false; 315 if ((valueCopy = strdup(arg->val)) == NULL) 316 errx(EX_UNAVAILABLE, "out of memory"); 317 valuePtr = valueCopy; 318 while ((user = strsep(&valuePtr, ", \t")) != NULL) { 319 pwd = lookup_pwent(user); 320 if (strcmp(grp->gr_mem[k], pwd->pw_name) == 0) { 321 matchFound = true; 322 break; 323 } 324 } 325 free(valueCopy); 326 327 if (!matchFound && 328 extendarray(members, grmembers, *i + 2) != -1) 329 (*members)[(*i)++] = grp->gr_mem[k]; 330 331 k++; 332 } 333 334 return; 335 } 336 337 338 static gid_t 339 gr_gidpolicy(struct userconf * cnf, long id) 340 { 341 struct group *grp; 342 gid_t gid = (gid_t) - 1; 343 344 /* 345 * Check the given gid, if any 346 */ 347 if (id > 0) { 348 gid = (gid_t) id; 349 350 if ((grp = GETGRGID(gid)) != NULL && conf.checkduplicate) 351 errx(EX_DATAERR, "gid `%u' has already been allocated", grp->gr_gid); 352 } else { 353 struct bitmap bm; 354 355 /* 356 * We need to allocate the next available gid under one of 357 * two policies a) Grab the first unused gid b) Grab the 358 * highest possible unused gid 359 */ 360 if (cnf->min_gid >= cnf->max_gid) { /* Sanity claus^H^H^H^Hheck */ 361 cnf->min_gid = 1000; 362 cnf->max_gid = 32000; 363 } 364 bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1); 365 366 /* 367 * Now, let's fill the bitmap from the password file 368 */ 369 SETGRENT(); 370 while ((grp = GETGRENT()) != NULL) 371 if ((gid_t)grp->gr_gid >= (gid_t)cnf->min_gid && 372 (gid_t)grp->gr_gid <= (gid_t)cnf->max_gid) 373 bm_setbit(&bm, grp->gr_gid - cnf->min_gid); 374 ENDGRENT(); 375 376 /* 377 * Then apply the policy, with fallback to reuse if necessary 378 */ 379 if (cnf->reuse_gids) 380 gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid); 381 else { 382 gid = (gid_t) (bm_lastset(&bm) + 1); 383 if (!bm_isset(&bm, gid)) 384 gid += cnf->min_gid; 385 else 386 gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid); 387 } 388 389 /* 390 * Another sanity check 391 */ 392 if (gid < cnf->min_gid || gid > cnf->max_gid) 393 errx(EX_SOFTWARE, "unable to allocate a new gid - range fully used"); 394 bm_dealloc(&bm); 395 } 396 return gid; 397 } 398 399 400 static int 401 print_group(struct group * grp) 402 { 403 if (!conf.pretty) { 404 char *buf = NULL; 405 406 buf = gr_make(grp); 407 printf("%s\n", buf); 408 free(buf); 409 } else { 410 int i; 411 412 printf("Group Name: %-15s #%lu\n" 413 " Members: ", 414 grp->gr_name, (long) grp->gr_gid); 415 if (grp->gr_mem != NULL) { 416 for (i = 0; grp->gr_mem[i]; i++) 417 printf("%s%s", i ? "," : "", grp->gr_mem[i]); 418 } 419 fputs("\n\n", stdout); 420 } 421 return EXIT_SUCCESS; 422 } 423